Abstract
Abstract Throughout much of the ocean interior, the diapycnal buoyancy flux is maintained by both mechanical and double-diffusive processes. Assessing the relative roles of each is a challenge, particularly in complex coastal environments. During February–March 1995, a repeat-profiling CTD system, equipped with a dual-needle microconductivity probe, was deployed off the central California coast (35°N, 121°W) from the research platform FLIP. The probe’s vertical resolution (8 cm) appears sufficient to resolve the low wavenumbers of the turbulent inertial subrange. This paper presents depth–time maps, spanning 12 days and 100–400 m, of temperature dissipation rate χ, and Cox number Ĉ. High χ and Ĉ values tend to occur in layers, on a variety of spatial scales. Simultaneously, finescale (6.4-m) Richardson number, effective strain rate, and Turner angle are measured. The occurrence of intense microstructure fluctuations is correlated with all three quantities, affirming that both mechanical turbulence and d...
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